Multichannel SAR Using Waveform Diversity and Distinct Carrier Frequency for Ground Moving Target Indication

Multichannel SAR Using Waveform Diversity and Distinct Carrier Frequency for Ground Moving Target Indication
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使用波形分集和不同载波频率进行地面移动目标指示的多通道 SAR

DOI:
10.1109/jstars.2015.2485166
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发表时间:
2015-10
影响因子:
5.5
通讯作者:
Wen-Qin Wang
Wen-Qin Wang
中科院分区:
工程技术3区
文献类型:
--
作者:
Wen-Qin Wang

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地面动目标检测(GMTI)在监视和侦察中有着重要的应用,但由于平稳杂波的影响,GMTI检测一直是一个难题。本文提出了一种基于波形分集的多通道合成孔径雷达(SAR),即多输入多输出(MIMO)SAR和不同的载波频率用于GMTI应用。所提出的方法采用MIMO配置与多个天线的方位和正交波形分集。在这样做时,在接收器处制定多个独立的发射-接收信道。由于每个天线都采用波形分集和不同的载波频率,采用相位中心偏移天线(DPCA)和沿航迹干涉(ATI)联合处理算法进行杂波抵消和噪声抑制后,通过双干涉处理估计出跨航迹速度。然后,利用分数阶傅里叶变换算法估计运动目标的多普勒参数,再利用联合信号处理算法得到GMTI。最后,利用一种通用的Chirp Scaling成像算法对运动目标进行聚焦。仿真结果验证了所提出的方法的有效性。
Ground moving target indication (GMTI) plays an important role in surveillance and reconnaissance applications, but it is a difficult problem due to the impacts of stationary clutter. This paper proposes a multichannel synthetic aperture radar (SAR) using waveform diversity, namely, multiple-input multiple-output (MIMO) SAR and distinct carrier frequency for GMTI applications. The proposed approach employs MIMO configuration with multiple antennas in azimuth and orthogonal waveform diversity. In doing so, multiple independent transmit-receive channels are formulated at the receiver. Since each antenna uses both waveform diversity and distinct carrier frequency, after clutter cancellation and noise suppression by the displaced phase center antenna (DPCA) and along-track interferometry (ATI) combined processing algorithm, the cross-track velocity is estimated through double-interferometry processing. Next, the Doppler parameters of moving targets are estimated with the fractional Fourier transform algorithm and then GMTI is obtained by a joint signal processing algorithm. Finally, the moving targets are focused with a general chirp scaling imaging algorithm. All the proposed methods are verified by simulation results.
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